package com.example.reflection;

import com.example.reflection.entity.User;
import org.junit.Test;

import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

/**
 * @author readpage
 * @create 2022-10-21 18:33
 */
public class OtherTest {
    /**
     * 获取构造器结构
     */
    @Test
    public void test() {
        Class<User> clazz = User.class;
        //getConstructors(): 获取当前运行时类中声明public的构造器
        Constructor<?>[] constructors = clazz.getConstructors();
        for (Constructor<?> c : constructors) {
            System.out.println(c);
        }
        System.out.println();
        //getDeclaredConstructors(): 获取当前运行时类中声明的所有构造器
        Constructor<?>[] declaredConstructors = clazz.getDeclaredConstructors();
        for (Constructor<?> c : declaredConstructors) {
            System.out.println(c);
        }
    }

    /**
     * 获取运行时类
     */
    @Test
    public void test2() {
        Class<User> clazz = User.class;
        Class<? super User> superclass = clazz.getSuperclass();
        System.out.println(superclass);
    }

    /**
     * 获取运行时类的带泛型的父类
     */
    @Test
    public void test3() {
        Class<User> clazz = User.class;
        Type genericSuperclass = clazz.getGenericSuperclass();
        System.out.println(genericSuperclass);
    }

    /**
     * 获取运行时类的带泛型的父类的泛型
     */
    @Test
    public void test4() {
        Class<User> clazz = User.class;
        Type genericSuperclass = clazz.getGenericSuperclass();
        ParameterizedType parameterizedType = (ParameterizedType) genericSuperclass;
        //获取泛型类型
        Type[] actualTypeArguments = parameterizedType.getActualTypeArguments();
        System.out.println(actualTypeArguments[0].getTypeName());
    }

    /**
     * 获取运行时类实现的接口
     */
    @Test
    public void test5() {
        Class<User> clazz = User.class;
        Class<?>[] interfaces = clazz.getInterfaces();
        for (Class<?> c : interfaces) {
            System.out.println(c);
        }

        System.out.println();

        Class<?>[] interfaces2 = clazz.getSuperclass().getInterfaces();
        //获取运行时类的父类实现的接口
        for (Class<?> c : interfaces2) {
            System.out.println(c);
        }
    }

    /**
     * 获取运行时类所在的包
     */
    @Test
    public void test6() {
        Class<User> clazz = User.class;
        Package pack = clazz.getPackage();
        System.out.println(pack);
    }

    /**
     * 获取运行时类声明的注解
     */
    @Test
    public void test7() {
        Class<User> clazz = User.class;
        Annotation[] annotations = clazz.getAnnotations();
        for (Annotation annotation : annotations) {
            System.out.println(annotation);
        }

    }
}
